Check the proceedings to AISC's NASSC conference from this last February. A
paper was presented during the conference by a company that does this type of
repair all over the country for straightening damage due to fire and impact,
such as your damage.
John Riley wrote:
> An insurance company has hired me to investigate repair to an impact-damaged
> bridge; concrete deck on four steel plate girders (48"?). Bottom flanges of
> two girders were displaced laterally, maybe 3 inches, and locally buckled.
> The girder top flange and the concrete deck appear unaffected.
> My thought is that the girders could be (a) realigned using a combination of
> force (applied to bottom flange) and heat (applied to flange and web) and
> (b) "cut and paste" at the localized buckling. Of course the owner wants a
> new bridge.
> So, I'd like to find relevant information on this type of repair.
> Thank you,
> John P. Riley, SE
> Riley Engineering
> Blue Grass, Iowa